If you constantly /tp a player, even if the specified coordinates are untouched relatives (~ ~ ~), moving around a bit will sometimes send you back to your position.
What I expected to happen was...
The player will be able to walk freely, without glitching.
What actually happened was...
The player will, if moving, glitch sometimes and teleport back to their old position.
Steps to reproduce:
1. Place on the ground a command block.
2. Put the command "tp @a ~ ~ ~" in it.
3. Put the command block on Repeating and Always Active.
4. Move around a bit.
There's probably already a report of this issue, but I couldn't find it so I created one myself.
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kumasasa
Found it: MC-44823
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Thanks.
I'm sure there's a description of this bug somewhere, but I noticed the same thing. It seems to occur when the computer is under a bit of stress for me.
I made a parkour map that required the player to teleport multiple times mid jump, and sometimes (especially when hosting a LAN, but sometimes when on single player) it would glitch me back to the most recent teleport position, even after landing.
It seems to occur ~1s after the teleport it glitches back to. It hasn't occurred for me since I got a new laptop.